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Habitat Utilization of the Endemic Poison Dart Frog Excidobates Mysteriosus in North-Western Peru

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Habitat Utilization of the Endemic Poison Dart Frog Excidobates Mysteriosus in North-Western Peru Department of Physics, Chemistry and Biology Master Thesis Habitat Utilization of the Endemic Poison Dart Frog Excidobates mysteriosus in North-western Peru SANDRA MONSALVE PASAPERA LiTH-IFM-A-Ex--11/2416--SE Supervisor: Karl-Olof Bergman, Linköping University Co-supervisor: Per Milberg, Linköping University Examiner: Matthias Laska, Linköping University Department of Physics, Chemistry and Biology Linköpings universitet SE-581 83 Linköping, Sweden Avdelning, Institution Datum Division, Department Date 2011-06-03 IFM Biology Språk Rapporttyp ISBN Language Report category LiTH-IFM-A-Ex—11/2416--SE Svenska/Swedish Licentiatavhandling x Examensarbete Engelska/English C-uppsats ISRN D-uppsats Övrig rapport _______________________________________ ________________ ___________ _______________ Serietitel och serienummer ISSN URL för elektronisk version Title of series, numbering LITH-IFM-A-Ex—11/2416--SE Titel Title Habitat Utilization of the Endemic Poison Dart Frog Excidobates mysteriosus in North- western Peru Författare Author: Sandra Monsalve Pasapera Sammanfattning Abstract The worldwide amphibian diversity is severely threatened, mainly due to deforestation. Lack of sufficient knowledge for species conservation is common. This is the first detailed study of the poison dart frog Excidobates mysteriosus including habitat requirements, occupancy patterns and behaviours. It is known only from one location in north-western Peru, living in Bromeliaceae plant species. The frogs and tadpoles were found in two unidentified Bromeliaceae species; Bromeliad Species 1 and Bromeliad Species 2. Bromeliad quality variables were evaluated for habitat requirements, behavioural recordings were performed ad libitum and catching-and-release with photographing of frogs for monitoring dispersals. Results show that for Bromeliad Species 1 significantly more frogs were present in bromeliads that were wider, received less sun exposure, had deeper water cavities and in bromeliads growing on lower altitudes. For Bromeliad Species 2 deeper water cavities had a significant effect on presence of frogs. In both bromeliad species higher presence of tadpoles were found in plants that were wider and had deeper water cavities. The density of bromeliads had no effect on frog or tadpole occupancy for neither bromeliad species. The dispersal, feeding and tadpole release behaviours are reported. Individual frogs were found to disperse 0-113m. The total number of encountered frogs was 1006 and 86 tadpoles, most of them found in three core areas. These areas should be targeted for conservation management and monitoring, diminishing the high deforestation pressure which saves old- growth forests and thereby as well the preferred wider bromeliads containing deeper water cavities and the biggest frog populations. Nyckelord Keyword behaviour, bromeliads, conservation, Dendrobates, dispersal, Excidobates, mysteriosus, Peru 1 Abstract 1 2 Introduction 1 3 Materials and methods 2 3.1 Study area 2 3.2 Occupancy of tadpoles, juvenile and adult frogs 4 3.3 Habitat utilization 4 3.4 Behavioural recordings 5 3.5 Data analysis and statistics 5 4 Results 5 4.1 Number of tadpoles, juvenile and adult frogs 5 4.2 Bromeliad quality in relation to frog occupancy 6 4.3 Dispersal, feeding and breeding behaviour 10 5 Discussion 11 5.1 Importance of bromeliad quality, density and altitude 11 5.2 Dispersal, feeding and breeding behaviour 12 5.3 Conservation implications 13 6 Acknowledgments 14 7 References 14 1 Abstract The worldwide amphibian diversity is severely threatened, mainly due to deforestation. Lack of sufficient knowledge for species conservation is common. This is the first detailed study of the poison dart frog Excidobates mysteriosus including habitat requirements, occupancy patterns and behaviours. It is known only from one location in north-western Peru, living in Bromeliaceae plant species. The frogs and tadpoles were found in two unidentified Bromeliaceae species; Bromeliad Species 1 and Bromeliad Species 2. Bromeliad quality variables were evaluated for habitat requirements, behavioural recordings were performed ad libitum and catching-and-release with photographing of frogs for monitoring dispersals. Results show that for Bromeliad Species 1 significantly more frogs were present in bromeliads that were wider, received less sun exposure, had deeper water cavities and in bromeliads growing on lower altitudes. For Bromeliad Species 2 deeper water cavities had a significant effect on presence of frogs. In both bromeliad species higher presence of tadpoles were found in plants that were wider and had deeper water cavities. The density of bromeliads had no effect on frog or tadpole occupancy for neither bromeliad species. The dispersal, feeding and tadpole release behaviours are reported. Individual frogs were found to disperse 0-113m. The total number of encountered frogs was 1006 and 86 tadpoles, most of them found in three core areas. These areas should be targeted for conservation management and monitoring, diminishing the high deforestation pressure which saves old-growth forests and thereby as well the preferred wider bromeliads containing deeper water cavities and the biggest frog populations. Keywords: behaviour, bromeliads, conservation, Dendrobates, dispersal, Excidobates, mysteriosus, Peru 2 Introduction Like most terrestrial elements of biodiversity, amphibian diversity is severely threatened (Sala et al. 2000), and the mountain regions have been especially hard hit (Young et al. 2001). The threats to the amphibians are various; deforestation, fertilisers, pesticides, acid precipitation, low pH, increased UV radiation, emerging diseases, introduced species, climate change, chytrid fungus (Batrachochytrium dendrobatidis), hybridization, human predation etc. (e.g. Duellman 1999 cited by Galindo-Leal et al. 2003; Beebee & Griffiths 2005). A global decline in amphibians was first recognized in 1989 (e.g. Vitt et al. 1990; Wake 1991) and the situation has not improved since then. In the end of the year 1998, 124 species of amphibians were categorized as threatened; in 2010 the number had increased more than 15 times to 1898 threatened species (IUCN 2010a). This is 29 % of the total number of amphibian species described in the IUCN Red List (IUCN 2010a), more than any other category of animals. Latin America harbours a highly diverse amphibian fauna representing half of the world’s total species richness (Duellman 1999 cited by Galindo-Leal et al. 2003). The amphibian declines are widespread throughout this area (Young et al. 2001). Peru harbour more than 500 species of amphibians and is regarded as a mega-diverse country (von May et al. 2008). One of the 70 threatened and endemic amphibian species (IUCN 2010b) in Peru is the poison dart frog Excidobates mysteriosus (Marañón Poison Frog). The species is classified as endangered (EN) and the population trend is assessed to be decreasing (Icochea et al. 2010). The frogs are only known from a single location in the vicinity of the village Santa Rosa at 1 the foothills of Cordillera del Cóndor (Cajamarca Department), north-western Peru, at around 1000 meters above sea level (m.a.s.l.) (Icochea et al. 2010). The knowledge about the frog species is scarce. Twomey and Brown (2008) performed a study on E. mysteriosus and used 13 presence points for a niche model, ending up with a possible distribution between 200-1500 m.a.s.l. They concluded that the species is terrestrial or scansorial and diurnal. Lötters et al. (2007) (cited by Twomey & Brown 2008) reported the clutch size to be 8-13 eggs, which develops into free swimming tadpoles that finally metamorphs into frogs. The only published note on behaviour found is from Twomey and Brown (2008) which wrote that the frogs are hesitant to jump and tend to “walk” instead. One of the key aspects of frog ecology is the breeding behaviour. E. mysteriosus is said to use Bromeliaceae plant species for breeding similar to other neotropical poison dart frogs from the family Dendrobatidae. Many species use the small pools of water that accumulate for longer periods in plant parts in plants from the families Bromeliaceae; Aechmea and Sarraceniaceae (Walls 1994; Dejean et al. 1995; Dejean & Olmsted 1997). Mature plants have four types of cavities, where the most crucial cavities are the interfoliar cavities that are deep and narrow and accumulate rainwater, which remains well into the dry season because of low evaporation (Galindo-Leal et al. 2003). The tadpoles may grow and metamorph at the place of oviposition or being transported by adults to water pools (Wells 2007; Weygoldt 1980). The utilization rate of individual bromeliads may be affected by different habitat factors (quality variables). Zotz and Thomas (1999) found that frogs were disproportionately encountered in large bromeliads. A study on the poison dart frog Dendrobates pumilio showed that increasing bromeliad density also increased the presence of adult frogs leading to more breeding, resulting in a higher presence of juveniles (Donnell 1989). In a study by de Silva et al. (2011) they found a bromeliad usage pattern, where higher presence of anuran frogs were found on bromeliads with higher sun exposure than on those who had lower sun exposure. No detailed studies have been performed on the behaviour including breeding or habitat utilization of E. mysteriosus. Crucial information for conservation of the species is therefore lacking. The main aims of this paper were to study the basic ecology of E. mysteriosus, including
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